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Single-ended quantity protection method of high-voltage transmission line based on specific frequency band energy ratio

A technology of high-voltage transmission lines and specific frequency bands, applied in emergency protection circuit devices, electrical components, power transmission AC networks, etc., can solve problems such as susceptibility to noise and lightning interference, low fault component content, and unreliable reliability. Low sampling rate requirements, short action time, and easy-to-achieve effects

Pending Publication Date: 2022-04-12
STATE GRID HUBEI ELECTRIC POWER COMPANY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of method is mainly based on high-frequency components, and the content of fault components in high-frequency bands is relatively low, which is easily disturbed by noise and lightning strikes, and the reliability needs to be improved.

Method used

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  • Single-ended quantity protection method of high-voltage transmission line based on specific frequency band energy ratio
  • Single-ended quantity protection method of high-voltage transmission line based on specific frequency band energy ratio
  • Single-ended quantity protection method of high-voltage transmission line based on specific frequency band energy ratio

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Embodiment Construction

[0033] Such as figure 1 As shown, this embodiment relates to a single-ended protection method for high-voltage transmission lines based on specific frequency band energy ratios, by collecting current and voltage parameters in specific frequency bands on the AC side and DC side to calculate the specific values ​​of the AC side and DC side. The energy of the frequency band, when the protection element starts, continue to refresh the current and voltage parameters and the energy of the corresponding specific frequency band and the ratio of the energy of the DC side and the AC side, and send a blocking signal to the AC side protection when the fault is judged to be on the DC side, and Judging the type of fault on the DC side, the protection of the corresponding pole quickly trips to remove the fault; when the fault is judged to be on the AC side, it sends a blocking signal to the protection on the DC side, and judges the type of fault on the AC side, and the corresponding protectio...

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Abstract

The invention relates to a single-ended protection method for a high-voltage transmission line based on a specific frequency band energy ratio, and the method comprises the steps: calculating the energy of specific frequency bands of an AC side and a DC side through collecting the current and voltage parameters in the specific frequency bands of the current side and the DC side; when the protection element is started, current and voltage parameters, energy of a corresponding specific frequency band and the ratio of the energy of the direct current side to the energy of the alternating current side continue to be refreshed, a blocking signal is sent to protection of the alternating current side when fault judgment is carried out on the direct current side, the fault type of the direct current side is judged, and protection of a corresponding pole trips quickly to remove the fault; when the fault judgment is located on the alternating current side, a blocking signal is sent to the direct current side protection, the fault type of the alternating current side is judged, and the corresponding protection rapidly trips to remove the fault.

Description

technical field [0001] The invention relates to a technology in the field of relay protection, in particular to a single-ended protection method for high-voltage transmission lines based on a specific frequency band energy ratio. Background technique [0002] In recent years, the scale of the AC-DC hybrid grid has been continuously expanding, and a large number of power electronic devices have been connected to the grid, and the coupling relationship between the AC and DC systems has become closer. The mutual influence of the AC and DC systems has not been effectively resolved so far. The malfunction of the relay protection caused by the coupling of the AC side and the DC side has led to further expansion of the fault area, causing large-scale power outages in the power grid, and affecting the safety of the power grid. Stable operation. Since the construction of a large-scale AC-DC power grid in my country, protection malfunctions caused by AC-DC interactions have occurred ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26G01R31/08H02J3/36
CPCY02E60/60Y04S10/52
Inventor 杨增力王晶李君周虎兵吴迪张浩高飘郑晓冬晁晨栩丛新棚曹亚倩贺杨烊肖正光邰能灵
Owner STATE GRID HUBEI ELECTRIC POWER COMPANY
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